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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW ULT GT3 DP] Blank screen at 3840x2160 resolution (both framebuffer and Xorg)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86377#c16">Comment # 16</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW ULT GT3 DP] Blank screen at 3840x2160 resolution (both framebuffer and Xorg)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86377">bug 86377</a>
from <span class="vcard"><a class="email" href="mailto:anssi@mageia.org" title="Anssi Hannula <anssi@mageia.org>"> <span class="fn">Anssi Hannula</span></a>
</span></b>
<pre>(In reply to Brian Campbell from <a href="show_bug.cgi?id=86377#c15">comment #15</a>)
<span class="quote">> I don't know if it's possible that the monitor would support
> a mode it doesn't advertise, but I figure it's worth a shot. Any idea what
> the proper modeline for reduced blanking v2 would be, and if it's under 450
> MHz?</span >
I made up a mode to workaround my issue (<a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB DP] FIFO underrun when trying to set a high display mode"
href="show_bug.cgi?id=85621">bug #85621</a>), but unfortunately
3840x2160@60Hz is not under 450MHz even with no blanking at all:
<span class="quote">>>> 3840*2160*60</span >
497664000
You are probably able to take the monitor's original 60Hz mode and just reduce
the pixel clock just under 450MHz to achieve 50Hz, though.
<span class="quote">>>> 450000000.0/4000/2222</span >
50.63006300630063</pre>
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